Start-up and shut-down voltage
This chapter should be read with caution and attention as long as the fans are not purely analog, i.e. DC-controlled fans with 3-pin connection. The PWM control electronics almost always stand in the way of clean voltage regulation and it is therefore also not advisable to regulate PWM fans via voltage. Nevertheless, we have also carried out this measurement for all models, regardless of whether they are DC or PWM fans, because even strange results say a lot about the control electronics and the use as a DC-controlled fan.
But first, to be on the safe side, we check the maximum speed at 100% PWM and compare it with the datasheet. The fan not only manages the specified data, but is even just above it. Of course, there’s always a little bit of series dispersion involved here, so that’s a perfect fit.
In today’s DC test, we see that the fan only starts up with voltages starting at about 2.8 volts, while Noctua’s fan requires at least 4.4 volts. In addition, all PWM fans achieve maximum speed and sufficient throughput as well as static pressure only when PWM-controlled. So I would not recommend a pure voltage regulation.
The roughly under 300 rpm is a good value for such a fan, although rather useless in practice. The PWM-controlled fan can’t be switched off, but it remains in continuous operation a bit below 300 rpm. There is no provision for a fan stop.
Start-up and shut-down behaviour
The following measurement curves once again illustrate the very different behaviour. Let’s look at DC control first. Here, only about 800 rpm are reached, below that it gets tight and the fan comes to a standstill. The DC control is therefore obsolete.
With the PWM protocol, we can also see very well the continuation of the fan, because there is a minimum speed. The rest then reflects the data from the bar chart.
Power consumption
This value is high, way too high. Consider that 6 fans alone would consume over 30 watts. That’s not something you want to do to a normal motherboard, and even half that would be a decent board with only 3 fans. That’s even more than the Phanteks T30.
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